Spot-light.



R. W. EBELING.

SPOT LIGHT.

APPLICATION FILED 1AN.22,191B.

PatentedAug'. 1, 1916.

IN VEN TOR. Faberz Wiic'lzzzg A TTORNE YS.

ROBERT W. EBELING, OF OAKLAND, CALIFORNIA.

SPOT-LIGHT.

Specification of Letters Patent.

Patented Aug. 1, 1916.

-- Application filed January 22, 1916. Serial No. 73,583.

To all whom it may concern Be it known that I, ROBERT W. EBELING, acitizen of the United States, residing at Oakland, in the county ofAlameda and State of California, have invented certain new and usefulImprovements in Spot-' Lights, of which the following is aspecitieation.

This invention relates to improvements in spot lights for theatrical useand more particularly to a device by which two or more colors may beblended as they are thrown onto the stage or screen.

The principal object of my invention is to provide a device whereby agreater variety of shades and colors may be produced by the use of acomparatively few color screens.

Another object of my invention is to provide a mechanism associated withthe projecting devices by which when the angle between the severalprojecting members is changed the length between the light and lens ischanged in a corresponding degree thereby keeping the spot of light onthe stage or screen approximately the same size.

With these and other objects in view my invention consists in the novelconstruction, combination and arrangement of parts as herein illustratedand more specifically pointed out in the appended claims.

Reference being had to the accompanying drawing forming a part of thisspecification, Figure 1 is a View in plan showing my improved projectorand diagramma tic view of the circuit in connection therewith. Fig. 2 isa view in transverse section through the projectors and their supportinbase. Fig. 3 is an enlarged longitudinai sectional view through one ofthe projectors. Fig. 1 is a bottom plan view showing the manner in whichthe light source is moved to correspond with the change in angle betweenthe several projecting members. Fig. 5 is a fragmentary view showing themounting of the means by which the angle between the projectors isadjusted.

In the construction here illustrated, I provide two projectors as 1 and2, both of which are similar in. construction and the correspondingparts of each are denoted by the same numerals. Each of these projectorscomprises the casing 3, provided at one end with the lens 4 and grooves5, in which the color screens are adapted to slide. These projectors arehinged together adjacent their forward ends as shown at 6, and

on the rear ends are provided with ears 7 between which is pivotallymounted a bar 8, this bar is provided with an opening 9, which on one ofthe projectors has right hand threads and on the opposite projector hasleft hand threads, and iii-engagement therewith is a right and left handthreaded screw 10 having a knurled wheel 11 in the center thereof. Thuswhen this wheel is turned the two projectors are simultaneously drawntogether or moved apartat their rear ends.

Adjacent the back portion of the casing is provided a plate 12, having aboss 13, wherein is mounted a lamp socket 14, containing an incandescentlamp, preferably of spherical form and having the light emitting sourceformed in a small contact coil in the center of the bulb. Terminals 16and 17 are provided in the rear of the boss 13, to which the supplywires are connected. The plate 12 on the bottom is provided with anextension base 18 slidable between the guide bars 19, these bars havingflanges which extend over the top of the guide plate, thereby preventinga tilting action when the same is moved longitudinally.

Plate 12 is provided with a pin 20, which extends through a slot 21 inthe bottom of the casing and there connected to a link 22,

studs, in which is engaged a screw threaded rod 24. This rod is providedon the one end with a collar 25, which abuts against a lug 26 formed inthe supporting member 27. A- nut or collar 28 is provided on theopposite side of this lug, thereby holding the rod 24 stationary inrelation to the base. The opposite end of the rod is provided with anoperating handle 30, whereby when the latter is turned the block 23 ismoved longitudinally, which in turn simultaneously moves the plate 12 ofeach projector, thereby keeping the lamps of both in uniformdistancefrom the lens. The base 27 is provided with a forwardlyextending portion 31 having a pin 32, on which hinged parts 6 arepivotally mounted.

One of the terminals of each of the lamps is connected to a conductor 33leading to one side of the source of current, while the other terminalof one lamp is connected by conductor 34 to the rheostat or dimmer 35,while the opposite terminal of the other lamp is connected by theconductor 36 to the rheostat or dimmer 37. The dimmers in turn beingconnected by conductor 40' with the op osite side of the source ofcurrent I pre er to mount these dimmers on a single shaft and have thewinding so disposed that when the resistance of one plate is increasedthat of the other is decreased.

38 and 39 denote switches adapted to short circuit the dimmers renderingthe same inoperative, if so desired.

The operation of the device is as follows :The knurl wheel 11 is rotateduntil the spot of light from both projectors coincide on the screen 40.Handle 30 is then rotated to move the lamps forward or backwardcorrespondingly, increasing or de creasing the size of the spot of lightdesired. The color-screens are then introduced into the guideways 5, as,for instance, yellow and blue, which will show green upon the screen.Now, if it is desired to show the change from green to blue, the handleoperating the rheostat is turned so as to gradually. dim the lampssupplying the yellow screen and correspondingly brighten that whichcontrols the blue screen. Then when the lamp controlling the yellow hasbeen dimmed to the desired point the latter may be removed and anothercolorsubstituted therefor when the reversed action of the dimmer takesplace and another color is thrown onto the screen. Not only are theseveral'colors and the intermediate combination shown on the screen, butall shades between the two colors are in this manner shown, and by useof screens having fanciful design and color combination any number ofnew and novel effects may be produced.

Whenever the projectors are drawn together at the rear ends due to thefact that it is desired to make the spots of light coincide at a pointfarther back from the stage, a corresponding increase in the size of thespot would take place but for the arrangement of. the links 22. Theselinks not only serve to simultaneously move the light when the handle 30is rotated, but when the projectors are moved together due to theshorter radius between the block 23 and the pin 20, and between the pin6, backward movement of the lamps will take place, which in turn willcorrespondingly reduce the size of the slidably mounted in each spotapproximately before such change in the angle takes place.

I claim as new and wish to cover by Letters Patent:

l. A spot light apparatus comprising a pair of projectors pivotallyconnected to each other adjacent their forward ends, and each having alight source and concentrating lens, means for varying the angle betweensaid projectors, and means for automatically varying the focal distancebetween the li ht source and lens inversely to the angle tweenthe'projectors.

2. A spot light apparatus comprising a pair of projectors arranged at anangle to each other, means for varying the angle between saidprojectors, and simultaneously varying the focal length of saidprojectors.

3. A spot light apparatus comprising a pair of projectors arranged at anangle to each other, and each provided with a source of light andconcentrating lens, means .for varying the angle between said projectorsand simultaneously varying the distance between the sources of light,and the concentrating lens.

4. A spot light apparatus comprising a pair of projectors mounted at anangle to each other, a source of light in each of said projectors, asource of electric current, electrical conductors from said source ofcurrent to said source of light, variable resistance in the conductorsto each light source adapted to increase the current in one circuit andsimultaneously decrease the current in the other circuit.

5. A spot light apparatus, comprising a pair of projectors, an electriclamp and lens mounted in each of said projectors, a base, a forwardlyextending arm on said base, a pin in said arm, hinge members attached tothe forward adjacent corners of said projectors, said hinge membersbeing pivotally mounted on said pin, a lamp support of said projectors,pins extending from said supports through the casing of said projectors,links extending from said pins to an adjusting block, means foradjusting theangle between said projectors, and screw means for movingsaid adjusting block.

In testimony whereof I aflix my signature.

ROBERT W. EBELING.

